Resolve "Avatare haben kein alt-Attribut im Image-Tag"

Closes #4014

Merge request studip/studip!2862

resources/assets/javascripts/lib/global_search.js

@@ -111,7 +111,7 @@ const GlobalSearch = {
 
                     // Optional image...
                     if (result.img !== null) {
-                        $(`<img src="${result.img}">`)
+                        $(`<img src="${result.img}" alt="">`)
                             .wrap('<div class="globalsearch-result-img">')
                             .parent() // Element is now the wrapper
                             .appendTo(link);

resources/assets/javascripts/lib/search.js

@@ -200,7 +200,7 @@ const Search = {
         // Optional image...
         if (result.img !== null) {
             $('<div class="search-result-img hidden-tiny-down">')
-                .append(`<img src="${result.img}">`)
+                .append(`<img src="${result.img}" alt="">`)
                 .appendTo(link);
         }
 

resources/vue/components/StudipAssetImg.vue

 <template>
     <img :src="url"
-         :width="width">
+         :width="width" alt="">
 </template>
 
 <script>